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Power and Thin Lenses in Contact

A convex lens...

Question

A convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together. What will be their resultant power?

A

+ 6.5 D

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B

- 6.5 D

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C

+ 7.5 D

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D

- 0.75 D

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Solution

The correct option is B $- 0.75 D$
As we know,
$P = \frac{1}{F} = \frac{1}{f_{1}} + \frac{1}{f_{2}} = \frac{1}{(+ 0.8)} + \frac{1}{(- 0.5)} = - 0.75 D$

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